Annual report pursuant to Section 13 and 15(d)

Income Taxes - Effective Tax Rate Reconciliation (Details)

v3.20.4
Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Percent of pre-tax income:    
U.S. federal statutory income tax rate 21.00% 21.00%
Permanent Differences 1.00% 0.00%
State taxes, net of federal benefit 4.80% 8.30%
Research and development credit 2.60% 3.40%
Withholding Tax (1.00%) 0.00%
Stock compensation (6.90%) 0.00%
Other (2.30%) 3.30%
Change in valuation allowance (20.20%) (36.00%)
Effective income tax rate (1.00%) 0.00%
U.S. federal    
Operating loss carryforwards    
Net operating loss carryforwards $ 90.2  
State Jurisdiction    
Operating loss carryforwards    
Tax credit carryforwards 88.8  
Research Tax Credit Carryforward | U.S. federal    
Operating loss carryforwards    
Tax credit carryforwards $ 14.9